windows: check for fd==-1 in uv_fs functions

sunos: look up free memory with sysconf(_SC_AVPHYS_PAGES)

test: don't assert that total_mem > free_mem

Assertion fails when running in a resource container, like a Solaris zone.
The total reported is the container's hard limit, the free memory

test: don't assert that total_mem > free_mem

Assertion fails when running in a resource container, like a Solaris zone.
The total reported is the container's hard limit, the free memory that of
the whole system.

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win: unbreak build, use UV_ENOSYS

common: add UV_ENOSYS error code

win: make uv_process_kill(proc, 0) report process status

test: uv_process_kill(proc, 0) should not kill the process

add uv_udp_set_membership for unix multicast support

- test-udp-multicast-join tests that multicast packets can be received
- stub src/win/udp.c until support added

windows: don't alloc readdir buffer for empty dirs

fix mingw build

build: don't set CC and AR

Allows user to override compiler and archiver through the CC and AR environment
variables. Note that this already worked as expected with `make CC=clang`.

unix: stub kqueue support functions on old platforms

sunos: fix uv_spawn()

SunOS does not set POLLHUP when the read end of a pipe is closed.

sunos: link against libkstat

Prepare for writable TTY to be blocking

unix: don't alloc memory for readdir on empty dir

test: fix compiler warnings

Update features

windows: fixes crash in pipe.c

win: add error mappings for ECONNRESET

better docs

unix: IPC stdio stream should be duplex

windows: fixes #193. Ensures that uv_fs_event deals with short and long names

unix: avoid unnecessary read() syscall

fix fs_utime & fs_futime tests on windows